| Patents for Hallis N. Stephan |
Patents 1 -
10
of 11
      |
| Picture | Number | Date | Patentee | Title |
| | 1,947,862 | Feb. 20, 1934 | H.N. Stephan, H.M. Lucas | Special High Speed Drive for the Spindle of Boring Machine and Other Machine Tools |
| | 2,208,311 | Jul. 16, 1940 | H.N. Stephan, H.M. Lucas | Horizontal Boring Machine |
 | 2,208,312 | Jul. 16, 1940 | H.N. Stephan, H.M. Lucas | Horizontal Boring Machine |
| | 2,255,176 | Sep. 09, 1941 | H.N. Stephan, H.M. Lucas | Horizontal Boring Machine |
| | 2,266,647 | Dec. 16, 1941 | H.N. Stephan, H.M. Lucas | Horizontal Boring Machine |
| | 2,274,171 | Feb. 24, 1942 | H.N. Stephan | Horizontal Boring and Milling Machine |
| | 2,310,878 | Feb. 09, 1943 | H.N. Stephan | Machine Tool |
| | 2,339,435 | Jan. 18, 1944 | H.N. Stephan | Machine Tool |
| | 2,350,174 | May 30, 1944 | H.N. Stephan, H.M. Lucas | Boring Machine |
 | 2,648,999 | Aug. 18, 1953 | H.N. Stephan | Horizontal boring, drilling and milling machine |
